mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-25 22:20:45 +00:00
efe1f06496
Fix the treshold typo in code by threshold.
Fixes: c0165c85c3 ("button: add a simple Analog to Digital Converter device based button driver")
Suggested-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
146 lines
3.2 KiB
C
146 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2021 Samsung Electronics Co., Ltd.
|
|
* http://www.samsung.com
|
|
* Author: Marek Szyprowski <m.szyprowski@samsung.com>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <adc.h>
|
|
#include <button.h>
|
|
#include <log.h>
|
|
#include <dm.h>
|
|
#include <dm/lists.h>
|
|
#include <dm/of_access.h>
|
|
#include <dm/uclass-internal.h>
|
|
|
|
/**
|
|
* struct button_adc_priv - private data for button-adc driver.
|
|
*
|
|
* @adc: Analog to Digital Converter device to which button is connected.
|
|
* @channel: channel of the ADC device to probe the button state.
|
|
* @min: minimal uV value to consider button as pressed.
|
|
* @max: maximal uV value to consider button as pressed.
|
|
*/
|
|
struct button_adc_priv {
|
|
struct udevice *adc;
|
|
int channel;
|
|
int min;
|
|
int max;
|
|
};
|
|
|
|
static enum button_state_t button_adc_get_state(struct udevice *dev)
|
|
{
|
|
struct button_adc_priv *priv = dev_get_priv(dev);
|
|
unsigned int val;
|
|
int ret, uV;
|
|
|
|
ret = adc_start_channel(priv->adc, priv->channel);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = adc_channel_data(priv->adc, priv->channel, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = adc_raw_to_uV(priv->adc, val, &uV);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return (uV >= priv->min && uV < priv->max) ? BUTTON_ON : BUTTON_OFF;
|
|
}
|
|
|
|
static int button_adc_of_to_plat(struct udevice *dev)
|
|
{
|
|
struct button_uc_plat *uc_plat = dev_get_uclass_plat(dev);
|
|
struct button_adc_priv *priv = dev_get_priv(dev);
|
|
struct ofnode_phandle_args args;
|
|
u32 threshold, up_threshold, t;
|
|
ofnode node;
|
|
int ret;
|
|
|
|
/* Ignore the top-level button node */
|
|
if (!uc_plat->label)
|
|
return 0;
|
|
|
|
ret = dev_read_phandle_with_args(dev->parent, "io-channels",
|
|
"#io-channel-cells", 0, 0, &args);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = uclass_get_device_by_ofnode(UCLASS_ADC, args.node, &priv->adc);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = ofnode_read_u32(dev_ofnode(dev->parent),
|
|
"keyup-threshold-microvolt", &up_threshold);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = ofnode_read_u32(dev_ofnode(dev), "press-threshold-microvolt",
|
|
&threshold);
|
|
if (ret)
|
|
return ret;
|
|
|
|
dev_for_each_subnode(node, dev->parent) {
|
|
ret = ofnode_read_u32(node, "press-threshold-microvolt", &t);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (t > threshold)
|
|
up_threshold = t;
|
|
}
|
|
|
|
priv->channel = args.args[0];
|
|
priv->min = threshold;
|
|
priv->max = up_threshold;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int button_adc_bind(struct udevice *parent)
|
|
{
|
|
struct udevice *dev;
|
|
ofnode node;
|
|
int ret;
|
|
|
|
dev_for_each_subnode(node, parent) {
|
|
struct button_uc_plat *uc_plat;
|
|
const char *label;
|
|
|
|
label = ofnode_read_string(node, "label");
|
|
if (!label) {
|
|
debug("%s: node %s has no label\n", __func__,
|
|
ofnode_get_name(node));
|
|
return -EINVAL;
|
|
}
|
|
ret = device_bind_driver_to_node(parent, "button_adc",
|
|
ofnode_get_name(node),
|
|
node, &dev);
|
|
if (ret)
|
|
return ret;
|
|
uc_plat = dev_get_uclass_plat(dev);
|
|
uc_plat->label = label;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct button_ops button_adc_ops = {
|
|
.get_state = button_adc_get_state,
|
|
};
|
|
|
|
static const struct udevice_id button_adc_ids[] = {
|
|
{ .compatible = "adc-keys" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(button_adc) = {
|
|
.name = "button_adc",
|
|
.id = UCLASS_BUTTON,
|
|
.of_match = button_adc_ids,
|
|
.ops = &button_adc_ops,
|
|
.priv_auto = sizeof(struct button_adc_priv),
|
|
.bind = button_adc_bind,
|
|
.of_to_plat = button_adc_of_to_plat,
|
|
};
|